Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001437749-22-012611-index-headers.html | 2022-05-16 16:06:12 | |
| 0001437749-22-012611-index.html | 2022-05-16 16:06:12 | |
| 0001437749-22-012611.txt | 2022-05-16 16:06:12 | |
 0001437749-22-012611-xbrl.zip | 194484 | 2022-05-16 16:06:12 |
| ex_366494.htm | 12604 | 2022-05-16 16:06:12 |
| ex_366495.htm | 12444 | 2022-05-16 16:06:12 |
| ex_366496.htm | 4837 | 2022-05-16 16:06:12 |
| ex_366497.htm | 4846 | 2022-05-16 16:06:12 |
| FilingSummary.xml | 41670 | 2022-05-16 16:06:12 |
| Financial_Report.xlsx | 77606 | 2022-05-16 16:06:12 |
| hpe20220331_10q.htm | 1224327 | 2022-05-16 16:06:12 |
| hpe20220331_10q_htm.xml | 921309 | 2022-05-16 16:06:12 |
| hpk-20220331.xsd | 66302 | 2022-05-16 16:06:12 |
| hpk-20220331_cal.xml | 56313 | 2022-05-16 16:06:12 |
| hpk-20220331_def.xml | 506775 | 2022-05-16 16:06:12 |
| hpk-20220331_lab.xml | 425753 | 2022-05-16 16:06:12 |
| hpk-20220331_pre.xml | 532477 | 2022-05-16 16:06:12 |
| MetaLinks.json | 758381 | 2022-05-16 16:06:12 |
| R1.htm | 58680 | 2022-05-16 16:06:12 |
| R10.htm | 6256 | 2022-05-16 16:06:12 |
| R11.htm | 67992 | 2022-05-16 16:06:12 |
| R12.htm | 40166 | 2022-05-16 16:06:12 |
| R13.htm | 10708 | 2022-05-16 16:06:12 |
| R14.htm | 24552 | 2022-05-16 16:06:12 |
| R15.htm | 11969 | 2022-05-16 16:06:12 |
| R16.htm | 43921 | 2022-05-16 16:06:12 |
| R17.htm | 21532 | 2022-05-16 16:06:12 |
| R18.htm | 6896 | 2022-05-16 16:06:12 |
| R19.htm | 5574 | 2022-05-16 16:06:12 |
| R2.htm | 106097 | 2022-05-16 16:06:12 |
| R20.htm | 45789 | 2022-05-16 16:06:12 |
| R21.htm | 23711 | 2022-05-16 16:06:12 |
| R22.htm | 12694 | 2022-05-16 16:06:12 |
| R23.htm | 11069 | 2022-05-16 16:06:12 |
| R24.htm | 112154 | 2022-05-16 16:06:12 |
| R25.htm | 12393 | 2022-05-16 16:06:12 |
| R26.htm | 59714 | 2022-05-16 16:06:12 |
| R27.htm | 40300 | 2022-05-16 16:06:12 |
| R28.htm | 9327 | 2022-05-16 16:06:12 |
| R29.htm | 17526 | 2022-05-16 16:06:12 |
| R3.htm | 18298 | 2022-05-16 16:06:12 |
| R30.htm | 9654 | 2022-05-16 16:06:12 |
| R31.htm | 36408 | 2022-05-16 16:06:12 |
| R32.htm | 9057 | 2022-05-16 16:06:12 |
| R33.htm | 41946 | 2022-05-16 16:06:12 |
| R34.htm | 18764 | 2022-05-16 16:06:12 |
| R35.htm | 73883 | 2022-05-16 16:06:12 |
| R36.htm | 12475 | 2022-05-16 16:06:12 |
| R37.htm | 13847 | 2022-05-16 16:06:12 |
| R38.htm | 26188 | 2022-05-16 16:06:12 |
| R39.htm | 9329 | 2022-05-16 16:06:12 |
| R4.htm | 85016 | 2022-05-16 16:06:12 |
| R40.htm | 7092 | 2022-05-16 16:06:12 |
| R41.htm | 18291 | 2022-05-16 16:06:12 |
| R42.htm | 13931 | 2022-05-16 16:06:12 |
| R43.htm | 2643 | 2022-05-16 16:06:12 |
| R44.htm | 9611 | 2022-05-16 16:06:12 |
| R45.htm | 62090 | 2022-05-16 16:06:12 |
| R46.htm | 22473 | 2022-05-16 16:06:12 |
| R47.htm | 9871 | 2022-05-16 16:06:12 |
| R48.htm | 43605 | 2022-05-16 16:06:12 |
| R49.htm | 9954 | 2022-05-16 16:06:12 |
| R5.htm | 50031 | 2022-05-16 16:06:12 |
| R50.htm | 46286 | 2022-05-16 16:06:12 |
| R51.htm | 41934 | 2022-05-16 16:06:12 |
| R52.htm | 12413 | 2022-05-16 16:06:12 |
| R53.htm | 5540 | 2022-05-16 16:06:12 |
| R54.htm | 7549 | 2022-05-16 16:06:12 |
| R55.htm | 18795 | 2022-05-16 16:06:12 |
| R56.htm | 22355 | 2022-05-16 16:06:12 |
| R57.htm | 16115 | 2022-05-16 16:06:12 |
| R58.htm | 18551 | 2022-05-16 16:06:12 |
| R59.htm | 39142 | 2022-05-16 16:06:12 |
| R6.htm | 4641 | 2022-05-16 16:06:12 |
| R60.htm | 36610 | 2022-05-16 16:06:12 |
| R61.htm | 77355 | 2022-05-16 16:06:12 |
| R7.htm | 99011 | 2022-05-16 16:06:12 |
| R8.htm | 7178 | 2022-05-16 16:06:12 |
| R9.htm | 62520 | 2022-05-16 16:06:12 |
| report.css | 2767 | 2022-05-16 16:06:12 |
| Show.js | 1085 | 2022-05-16 16:06:12 |